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Discovering Earth's Depths: Exploring Bathymetric Maps

Delve into the world of bathymetric maps, showcasing the hidden depths of lakes and oceans through contour lines and color codes. Learn about echo sounding technology, nautical charts, and the fascinating Mariana Trench. Convert ocean depths from meters to miles and kilometers. Uncover the history of mapmaking in early human civilizations and get hands-on with an Earth model activity.

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Discovering Earth's Depths: Exploring Bathymetric Maps

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  1. Introducing Earth

  2. Chapter Eight: Mapping Earth • 8.1 Maps • 8.2 Topographic Maps • 8.3 Bathymetric Maps

  3. 8.3 Bathymetric Maps • A bathymetric mapshows the depths of a body of water such as a lake or an ocean. • Bathymetric maps use contour lines like topographic maps.

  4. 8.3 Showing depth • Color is also used to show depth in a lake or an ocean. • Shallow areas may be light blue and deep areas may be a darker blue.

  5. 8.3 Technology and bathymetric maps • The average ocean depth is 3,711 meters (12,175 feet). • The deepest place of all is the Mariana Trench) which is 10,923 meters (35,838 ft). Can you convert these distances into miles and kilometers?

  6. 8.3 Technology and bathymetric maps • Scientists measure these great depths using a technology called echo sounding or sonar. • A device on a ship sends sound waves outward from the bottom of the ship.

  7. 8.3 Technology and bathymetric maps • Sound waves from the ship “echo” off the ocean floor. • It takes time for the echo to return to the ship. • The longer the echo time, the deeper the water!

  8. 8.3 Nautical charts • Nautical charts are important tools for anyone in interested in navigating bodies of water. • Charts indicate hazards that can sink boats and show markers leading to channels.

  9. Investigation 8B Bathymetry of the Sea Floor • How can we tell what kinds of features are on the sea floor?

  10. Technology Connection Modern Map-Making • According to archaeologists, the history of mapmaking dates all the way back to early humans.

  11. Activity Circle the Globe • In this activity you will create a model of Earth.

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